mismatchedcharexception.java

来自「SRI international 发布的OAA框架软件」· Java 代码 · 共 133 行

package antlr_oaa;

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/RIGHTS.html
 *
 * $Id: MismatchedCharException.java,v 1.1 2002/11/08 17:37:52 agno Exp $
 */

import antlr_oaa.collections.impl.BitSet;

public class MismatchedCharException extends RecognitionException {
    // Types of chars
    public static final int CHAR = 1;
    public static final int NOT_CHAR = 2;
    public static final int RANGE = 3;
    public static final int NOT_RANGE = 4;
    public static final int SET = 5;
    public static final int NOT_SET = 6;

    // One of the above
    public int mismatchType;

    // what was found on the input stream
    public char foundChar;

    // For CHAR/NOT_CHAR and RANGE/NOT_RANGE
    public int expecting;

    // For RANGE/NOT_RANGE (expecting is lower bound of range)
    public int upper;

    // For SET/NOT_SET
    public BitSet set;

    // who knows...they may want to ask scanner questions
    public CharScanner scanner;

    /**
     * MismatchedCharException constructor comment.
     */
    public MismatchedCharException() {
	super("Mismatched char");
    }

    // Expected range / not range
    public MismatchedCharException(char c, char lower, char upper_, boolean matchNot, CharScanner scanner) {
	super("Mismatched char");
	foundChar = c;
	expecting = lower;
	upper = upper_;
	// get instantaneous values of file/line/column
	this.line = scanner.getLine();
	this.fileName = scanner.getFilename();
	this.column = scanner.getColumn();
	this.scanner = scanner;
	mismatchType = matchNot ? NOT_RANGE : RANGE;
    }

    // Expected token / not token
    public MismatchedCharException(char c, char expecting_, boolean matchNot, CharScanner scanner) {
	super("Mismatched char");
	foundChar = c;
	expecting = expecting_;
	// get instantaneous values of file/line/column
	this.line = scanner.getLine();
	this.fileName = scanner.getFilename();
	this.column = scanner.getColumn();
	this.scanner = scanner;
	mismatchType = matchNot ? NOT_CHAR : CHAR;
    }

    // Expected BitSet / not BitSet
    public MismatchedCharException(char c, BitSet set_, boolean matchNot, CharScanner scanner) {
	super("Mismatched char");
	foundChar = c;
	set = set_;
	// get instantaneous values of file/line/column
	this.line = scanner.getLine();
	this.fileName = scanner.getFilename();
	this.column = scanner.getColumn();
	this.scanner = scanner;
	mismatchType = matchNot ? NOT_SET : SET;
    }

    /**
     * MismatchedCharException constructor comment.
     * @param s java.lang.String
     */
    public MismatchedCharException(String s, int line) {
	super(s);
    }

    /**
     * Returns the error message that happened on the line/col given.
     * Copied from toString().
     */
    public String getMessage() {
	StringBuffer sb = new StringBuffer();

	switch (mismatchType) {
	case CHAR :
	    sb.append("expecting '" + (char)expecting + "', found '" + (char)foundChar + "'");
	    break;
	case NOT_CHAR :
	    sb.append("expecting anything but '" + (char)expecting + "'; got it anyway");
	    break;
	case RANGE :
	    sb.append("expecting token in range: '" + (char)expecting + "'..'" + (char)upper + "', found '" + (char)foundChar + "'");
	    break;
	case NOT_RANGE :
	    sb.append("expecting token NOT in range: " + (char)expecting + "'..'" + (char)upper + "', found '" + (char)foundChar + "'");
	    break;
	case SET :
	case NOT_SET :
	    sb.append("expecting " + (mismatchType == NOT_SET ? "NOT " : "") + "one of (");
	    int[] elems = set.toArray();
	    for (int i = 0; i < elems.length; i++) {
		sb.append(" '");
		sb.append((char)elems[i]);
		sb.append("'");
	    }
	    sb.append("), found '" + (char)foundChar + "'");
	    break;
	default :
	    sb.append(super.getMessage());
	    break;
	}

	return sb.toString();
    }
}